- A book
- A table
WHAT TO DO
Push the book on the table with your hands. Bring the book back to position and place a few straws in its way and then push the book over it.
When you push the books with your hands, you find that some amount of force needs to be exerted in order for the books to move. This is not the case when the books move over the straws and the effort required is a lot lesser.
WHY THIS HAPPENS
Since the surface of the table is not smooth enough, it causes friction, and therefore the force needed to move the book is much more. When the book moves over the wheels, the surface is smoothened, and the friction is much lesser. This is why the book moves better on wheels made of straw!
Attempt to do this experiment in the playground where the surface is uneven. Do the straws still assist in moving the book with greater ease?
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